Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299d2f5e3ac722f2d89da0a8a93ef830ced5920db7e6bb491bb2463a585465e0' 
  AND token = 'YdBLWRp26Pd7n6XIdlK98c6hU/uvxrkWbznQi7dzkUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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