Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb31316d932a1a1c43dc579b6c395163283d469c7979526b668181ea717521c' 
  AND token = 'KLHGHmLYPoc6FE08BbIj6vLAMhgKQtYzFy3wiP0E87M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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