Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd930128fe7a2428f3b3739747e26d34442d7e53d7aef3513fbfdc681102b49c2' 
  AND token = 'ELUCq2bKwQt4LmXqMXYbbqZHOXc05ZSy7Vo2qaCIy4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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