Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '191179f910da5e20c2a6db6f6f3da0282f3db6318ef6108a9c85bea6d405a41a' 
  AND token = 'hA/lukcdovpLAd9IWufFQWkH14a64089FFQNkqLr4AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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