Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c04a2a7787e0c9292a0e56ae46cbdcd146b7c3f46bcf1d10dd3dec2425ea0a' 
  AND token = 'c2sYBc80vCi2shJ7153XR3AAb/BwUAD9YTUi2dsHMgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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