SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1949c4463c9164a48fcf0e3b6d0b952a0d680c8cad96aafe0a5a21680d47c98d' 
  AND token = '1iUbpDqZcXteHjCKFV2YcUwutIBMszt1Pz7/XBltkTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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