Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139d209cf3c0d7102c036454f46d5773fb3c6d78b0679ece027ef384f9a61930' 
  AND token = '/pkQTIUagFK2cVTaJsGj+9sA+oNzCc7E7nfvMBM2m8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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