Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3c28d70f02fabc7830f07230ad2972111c13bf234234d6a864a7332f29018a' 
  AND token = 'RnR3Xxw7cGxicqcvsuKvaaiCOg4gpBGKDGCcVhIhtms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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