SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f572145fad39f94002d6b2094a3f4ad5fe9efafcd5ebfe2e1b3b862a198279e' 
  AND token = 'cHIW8FvbLazzwnIizFUZoSRnJIK9+WIu6lNKw0dp0gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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