Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a1d3f79e4223ecb5bca6ce79a24a475d253e3d5daede76b2f3e62a958bf676' 
  AND token = '6ROCpCIf4QURkxGjstImMZuJsmH1fZS5NkQrpXWREnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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