Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d6ae2d11bf9a072f57edb99cc23164e84c769b2a60634f8e9008e89f0f70e54' 
  AND token = '84amHD5wg0Ls0J1EWxqoyRdFEeD2uZfN4egk8l0ZJg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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