SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9dcf39d56c2b7a7f785cddc6aa2700f96124931dbd79844c57d77254ca942ea' 
  AND token = 'B85jSvXue/2Bx/K6lNQtRLrGtMi+YzhYxxKMrxu0Rj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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