Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b710d14b7dccb14cc8598bd70ef8a913c7947b56a3fa3d51f1fd45a44fc4561' 
  AND token = '3sxqalelnCI4cWOknYcIYG8cn4MOvbAxBPzIhh4z/0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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