SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0da2ac1cd135a8b623a9288c8e8ecea0211d509bfe98724d325037857094421c' 
  AND token = '+qm6GSiepEX6pIE9EmNL5PJdFHsHyzNwJ7/jIhJY1Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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