SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70059bd5b365a04c6dbe5fff361bda882234c312529250aa921d5bf6e80bcc07' 
  AND token = 'UFgvf0zV9+gxu/EXMOiPA/EbSKbcnjkdCZ2tVFg5I8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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