Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd8b11bed08b6ce46cdf70a3f844155a5d90cdd07ad8538f17e120419082af4' 
  AND token = '3/YsqsKYa/ygFcfSK5GMDm12UUI6EYHA10ZqwEICKqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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