Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7354258a4ba4fdce6616d7e9f8e8dbfb6342fa2b83ce0b4a70b18cabb7210aa' 
  AND token = '0awc0uRDzclgRBTKniJEbVB5lVwzP3khZJDlppey0qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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