Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76864517bbd8d94d664e01d7e1a2e243943f23213732baf9b0487bb238f3a03' 
  AND token = '2pOqeHsf2FEyyCZO+0/T53d0l9dsSgYJzMCTyL7QpG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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