Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e66721dc4e6b9ceeaf3b6f66fa4cb084fa5b1e9aeab4a7d3306c2dd134913e' 
  AND token = 'FngxgOoOXA1KlG5AkfLNixrBPDb6pU47FgcrWKFP4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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