Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4659ce1d21b06c60faec20ec91a1e34090cdff3cc3b4670f1b3a26964d497e' 
  AND token = 'i/xvKsMFCaWPHfCRBMEow/2WMIT0Yo0kB25H5epYiX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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