Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd34bf6f52a5dca492e08f81bb11a74d84c2a123861f0a7a7945327bf4c619' 
  AND token = 'gBNneW/h0ovJXjgC8+17NXdfAeP3bGJcstpZN33TrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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