Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43e565463801fde54288b4602d31d6efca0f3c25fbcdd4e9b38fc81934c6e8e' 
  AND token = 'p2zg3Kf+sMyuFR1pEXVlA3TWpDpSMrUXpYoabeBnCj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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