Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c6d5c3c20b01a37129aa9ff3b880987c5de26f9ba6bf9ba1c44f08bf2b857b' 
  AND token = 'IC35BbZxSW1++IznRuDk/OexXwZA46u851+6uz+HVT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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