Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6147fe02aff5766bedc951a96f03e51f77d4d40460f5e20a26afd8c831170df6' 
  AND token = 'pgOT9ndNC/UyFhyZaJji8RuK0MLgI5RoK2zlGcAE4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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