Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b257a37a7bf700b97211d315c33f99f5b2dd1e6e598dafe244dd2c322a84da27' 
  AND token = 'W3MNZmUcXNE6s8lICESsqBGVvxkPxcVLawZIkLLMLsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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