Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8562973d953f2012d9ff060bf5f7810dc2921d4997b5d68916d25d9690524f9f' 
  AND token = 'ynJQxQhQ2clxEGmrqKTj4cV9cNwF+JkWNq9ZPi0t8Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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