Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34db2e8e0b462801de8d8227662cf1f7992220ce3eef1d4029f2160678b51712' 
  AND token = 'e2EAjjBwObPgk4kxCTDWh+NfqM9RJ+MVf0n5NZqasdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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