Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68186a3c8497fa132c289cd54f74cafafd02da23f736429f235522331d9e881' 
  AND token = 'nOH/WLOMeqk/9rMvRZNFqUx+c8ddNWCqIVyrus6ribY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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