Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32d60a750e58e5a0d92eeb9fde45c5167c5e71b7ddaee417cd9c3e2ff97307c' 
  AND token = 'rMP2VSKFi9hIFrs/RkSRIf3SH+Lhy/d4btDgppc5CXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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