SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '33f0b33fc3c9b6a4e027c5e631122ed0fcd9fc8e5af4687d63eb476256cbbb04' 
  AND token = 'RFQxgUfMBX0VQ3q+1fMtwdxCPF9PIWvGCILEjZ8Ji8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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