Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15c14925a46a59b8941209c1816ebe620e07a060af92aec4ce4397aae712610' 
  AND token = '9A+VtkJFHC5Oi35Db64TDVG165Ay9egmWYqI5htWRpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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