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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8a69a9f6375f12c014a0f4510589bd8a898b37622cfa7a5b7e050437c58b4d9d' 
  AND token = 'KLFNluPJfN37gjcB0dmgK2LF4ZjdJAXauoAJOCOc+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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