Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b01e5c9fc668a30f88a2a171d1ec25c72f61bcf9f9e15e304fbe810afe2fb5d' 
  AND token = 'E9UNcYCDGHt+dBj3se4HRh4KvT2VAp8mOoqck1B9A2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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