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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7d2a865ec3eed1193116a50f808a8ac596919c05e87c78fce93d82174a1962a8' 
  AND token = 'rpAFu02edmRG2kfC5B82IGpVQc1CwcBuvV9OFQCPwmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}