Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccef90f3df784aec6100da98bb3726001a0980382bf259715bf9d0e2e2b0baa' 
  AND token = 'Yh2tVLIZTtLtk4zUlo5+rYzxLlAGvz/T3/IACy+AhyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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