Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a3754b3ca3543f99d8c1e661b77451c307f15068677f07861594c3e402ac71' 
  AND token = 'PU0llArfVtKqXHjQ262QhMDjwRg75v7E6JT6VVILkOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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