Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17611f1cc38caf7684fdf0be5bce31d8e513285bc87a5fec82278845a88f54c5' 
  AND token = '+mIopReLI8wy+ufcZ+x1Gr4LXRoSy+DgmqsJTJMJ/Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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