Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12baa9ac7256a3feefb451ffa0edeb0e8a79dc47a6b38f4cc0e37ecc69c0c010' 
  AND token = 'SUU3QeRGC2itOk6z76fblXOubN7+1nWdf39N0moxjuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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