Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7755c900721cab76ca7db650be0c2017875ff5611c113b5416e58f3f26b049c' 
  AND token = 'Ts7ai3R37CNuwoaqXHGVN8raRXRQjjcLLQbNmUG3K+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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