Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40fe9bdb8be0adb610a91cddeb1f36672af8b402fc9c923de1ef0c9370ec983' 
  AND token = 'Z1J62Ri3FfYkCc+Vl+O9Xtgfc7KRktgOncLjNyyjziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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