Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b51f19fc53d6410b0ae3bae546f4a76f340ddc7322fd41ea1fc75b6e6f398c2' 
  AND token = 'izG+/bQrDk8tUasOz9oxOSEeEXMSCJcM4JlSFdHaTOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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