Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74340321bbc7a9eb99d0f3780b91e4445c93985b560e8e57cf9ae06ef5c56563' 
  AND token = 'FieY9LbrXcYL15xp7JW8fb1rpMm1ze9z/8xUbh5wKNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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