SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2ba3690af4d98265bce2f5f5207cf0985e0b53239bf73c2bc3578e1afd307fa' 
  AND token = 'hBh8wVUm+wxpFNqnHR98mX3xAJ/N6Qq88kKe2dII7Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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