Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f704d3f9025380da2885efaf30836f9938fd2f6e1ef8b22ea6a02c0fe155f36' 
  AND token = 'le+pTOlwZldninD6ldxn4vf9QUOgqby6WSOxILxGyMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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