Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669b538d974ac29c59eae633719e909e82f923a97bf1c473a85d1afe7476d33c' 
  AND token = 'K/mFeDDWs+Otf0k0ZHCNn7LyEAVcH/vd4Msi4IN5iMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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