SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3b37314501ce7b364a504a4df2775da90e75ce11b56015528afe20fff37ef8d' 
  AND token = 'lW8qSoi+vPshLw/jsFZzEIg3gfTtZheyWJDGPx+Sopo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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