Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe082a617762b684093ec84ab54bcc6af1f736b948cf26e4d6edd9d050dba73' 
  AND token = 'nRY6I9f4UqSnK7Py/bQRBFceQSHUWUQKgDmBsii6Il4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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