Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a2f1d60af53d45b10401998ccfcc4d6d78210b30202c5a335f06e64f815d34' 
  AND token = 'jkVbfz5pAe/KIf9Lzs5GYr7sbrRyvm6/MA/3uQmtlUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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