Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef925b9df6f70c8e4814dfcc7359e7768141052c1dafef6a99ee5a3b0e6fd91' 
  AND token = '4It97lHAdTtErCrpPN4Rq+32K/uVxAJWCpAW0SzD20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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