SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb596f02928f8db6404453ac15df1386668b6db375cd19ea78296b95d52ca959' 
  AND token = 'uxlRavTJ+CgD/sDOVyPc2R6SneAFXYqqch5WkklkmH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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