SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fa0785fd5d28a3da7a74b7934616996bc7f057598adda8f8ea6f3ee3ee42001' 
  AND token = 'DeYeQ/d1Ed9hLlyrxAi2MXnzyXxBKLqwqPHvp0cBpZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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