Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21444053f197171c33cb522708d1bee970a1ec65e754094ab938d20f6ffa3e3f' 
  AND token = 'DzfkFbjTLt4VcUgunne68paHBavysNJHr8Ygkw/wH9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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