Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb71c49eb613e813ccf5aeeb1adf79484a57d9c9f853b76f8cf6c621616f0e17' 
  AND token = 'pUbRKKjw6jkRiFQwBwVffJSFfCEHjeP4IxAPudFZFI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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