Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510458149604cf208f8bb1fc8a6fcf3343bdadf1425bf7fac68547618462cd51' 
  AND token = '/i7Dhs+bDG7yUQK1Z2EQDbIhZ1Nyqim8MHvC6m45WLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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