Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a50813d36c63c6abd092fcf7607714aaf12dad5e930f43043b5ffde0e8b044d' 
  AND token = 'M1gkVnGd2OfkmQcsfTs9ipxIAplx0qhXt5Jm7uSJwaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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