SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9440fe75918dddc2a9c354354fbcbb89815d0ea94942f4150cb73db072e4766d' 
  AND token = 'yVrQBZVeyMWvns4BJRmxYgU6OAcitwnYvZgo/W2nsAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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