Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b91e7e33c6516ecddfbdced493f6424353f42f460996e0d7fbad6a1a8ae4a0c' 
  AND token = '0b0STcY+6qvx8ADGAUBbFjv30mvRqjKX8sZFdIjmLeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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