SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b00ae0e281cbeeb17d105dad744ac277de32fb657e2620a077132120d8ae4748' 
  AND token = 'Y94BAuSoZwKz+ov5fupW/ykC/OAp3FL2H1QpgozS9VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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