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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b2faebbb7eea1e2568437c14d902d08adae01d360a017e75bd342ff951ac70f6' 
  AND token = 'FiVcZE5OPMPNcJyjQRjTYL03SU0ILg5ZaXY9OXRO68I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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