SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '058631eaa011f85d0f638a3bd21fc876038214e9044b63415b2ba063e18cd869' 
  AND token = 'LjPKbeIRC43YW46PTBqf5/hqywcWkg6HByUvqhIR1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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