Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37a39104cbb74d2d3d74f0e61c556c972235ea74d57b765769dbe9aaa6bd0f7' 
  AND token = 'yNefiGHE/RI8lX1KuGfG+8wUcZR1ss7k1ovtH7KZEf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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