SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2549aa5765aa32d627098911c44f394c02a3cb1facfa40ce8f69b4d8245d1dd2' 
  AND token = 'd/xTgUlY4OsCmLGcYR2grYXp2dIKYJOx+aM3KZvr/e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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