Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a5dde5a9814a7928343464e2b00268b4e938e41758b0b538c12775f300f441' 
  AND token = 'VsBM6ZEVjjojB6A8JIwi4npT+eKMVOnEZu0yFiihhQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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