Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6239dfa826230f8bc608a75b2e7dab5c9fd29233effbae442c4fd676cabfb908' 
  AND token = 'JqlA/l9LW0wBaaaKr7oI+a2w2qRKY3WNo8bm5AUvmyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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