SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a06ad362985fb291e201ba494f92b7b6f5ffaaa5d2020e3f33c6bca418875927' 
  AND token = 'o3E25LG7ts4YYrVsPyvC1/zQu7Dn/ZZyEbY2J+yaC6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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