SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebfc6844c1bb72748baa6858ce937311b16e37f0bbcc6359f02e369277693323' 
  AND token = 'GabmOEAgd/wGY8DBKbO+VujMP72WN+p1i+BvWqek9Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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