Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed4a3f02dfef4a98c5a0e12075635db78649b43053bf4e8ff75eebec880c42dd' 
  AND token = 'VAB9lkiSk49TuN5TPmzt+fYKNgujJD3ikl9jD5lLU24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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