Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52e93f51a2943bdc1e1279528825830b66a7edfdbe5d94585f2bd98f1bd1489' 
  AND token = 'rP+5ufeUl7ZRowE8HXi+41BPbgUTZUChZ2bp+1ARNqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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