Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ceeff0a9ea90a0536c4e71a361ce11c90c98cf51665a1d1f88fcbe07d1e661b' 
  AND token = 'vobQNKveejorx9vm3mxp6iuDSsmK+f2fSFd0o3WLNqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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