Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e392739a7fe1f607261930058da480c0f459619645f4ab73ef3b467a712eb93c' 
  AND token = 'VSXiWybM9VbVF6u3mlN0s7gzzS1werYqePNC9+eHXIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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