SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c059aa1ca590f4ecc1f8f062cb776773acb445988540ef326dc82ae02f0f9d82' 
  AND token = 'mgGSTOUDKLMTptVBHFkyGyoeTLHq8MU3KtKV29F1rAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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