Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728cf43798a74ab91b44a4eeb4440f8d18cb1ca98817dc57e640342a6e76d42b' 
  AND token = 'PQQhDI2wn+8nEMQm8ecDnoM1DgMfFB1GZ/gEZW7ulec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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